5 known satellites, details of which are given in table 2 . An additional satellite named Thames, was reported by W.H. Pickering in the early 20th century, but it has not been recovered and probably does not exist. In 1966 A. Dollfus announced the discovery of an inner satellite, named Janus, moving at 169,000 kilometers from Saturn in a period of 0.815 day. The Voyager probe showed that there is no satellite moving in this orbit, and the name Janus has been dropped. It is probable that Dollfus’s observations actually related to some of the small inner satellites discovered by the Pioneer 11 and Voyager probes.The unnamed satellites S.14 and S.13 move in orbits close to the inner and outer edges of Ring F and probably keep this ring stable. S.10 and S.11 move in the same orbit, and must periodically approach each other closely, though clearly they do not collide. S.12 moves in the same orbit as Dione.Phoebe, the outermost satellite, was not within the range of Voyager 1 probe, and little is known about it. It may be a captured asteroid. Iapetus is unique in having one hemisphere of high albedo and the other of low albedo, this explains why when Saturn is observed from Earth the west side appears much more brighter than the east side. As with all the other satellites, Iapetus has a captured rotation, that is its axial rotation period is equal to the time taken to complete one orbit. Table 2, Satellites of SaturnSatelliteDistance from center of Saturn (km)Period(days)Orbital eccentricityOrbital inclination(degrees)Diameter(kilometers)S.15138,2000.60??80S.14138,6000.613??500S.13141,0000.6290.007?600S.10149,4000.6950.013?700S.11149,4000.6950.013?135x70Mimas185.4000.9420.0201.5350Enceladus238,2001.3700.0040.0520Tethys294,6001.8880.0001.11,020Dione377,4002.7370.0020.01,120S.12377,4002.7370.0?0.5?80Rhea526,8004.5180.0010.41,530Titan1,200,00015.950.0290.35,100Hyperion1,482,00021.280.1040.4440Iapetus3,558,00079.330.02814.71,440Phoebe *12,9...
